Closure plug



H. T. KRAFT CLOSURE PLUG Filed March l5, 1954 April 7, 1936.

M mm Patented Apr. 7, 1936 CLOSUBE PLUG Herman T. Kraft, Akron, Dhio, assignor to 'The General Tire & Rubber Company, Akron, @him a corporation o! Ohio Application March 15, 1934, Serial No. 'lllg 5 Claims..

llhis invention relates to removable closures for containers and it is one of the objects of the present invention to provide a removable closure of new and improved construction which will provide an ecient seal with the walls of the opening in which the closure is disposed and which can be economically manufactured.

.another object is to provide an improved closure plug which is deformable to provide a huid tight seal with the walls of the opening in which it is disposed.

With the above and other objects in view the present invention consists of certain features of construction and combinations of parts to be hereinafter described with reference to the ac companying drawing and then claimed.

ln the drawing which illustrates a suitable em-=l bodment of the invention,

Figure l is a longitudinal section of the closure plugin position in a container opening, the container being shown in fragmentary section;

big. 2 is a view similar to l but showing the closure plug in its deformed sealing position; and

rig. d is a plan view of the closure plug shown in Figs. l and 2.

lteferring to the accompanying drawing in which lihe numerals refer to like parts through out the several views, l have shown a fragmentary portion of a container ib of the character shown in my zzo-pending application Serial No. m5,525, filed January 6, i934, and which is in the form of a one-piece brous body or drum having a lining il of gum rubber, this container being particularly adapted for the transportation of acids. "While l have shown the closure about to be de-J scribed in connection with the acid drum ill, it is to be understood that such. showing is for the purpose of illustration only and that the closure is suitable for use in any type of container hav ing a nller or drain opening.

ll'he closure of the present invention is formed of a suitable body of rubber or other suitable deformable material and comprises a circular body portion if having a peripheral flange lil which is adapted to seat against the head ill of the container lli while the body portion if eirtends through the opening lb in the head id well beyond the inner face lb thereof.

'The body portion if is formed with a central recess ll, the bottom of which is disposed some distance below the plane of the inner face lb of the head llt so as to provide an annular deformable wall |18 between the planes of the bottom of (EL 20d- 2) the recess Il'l and the inner face it as shown in Figs. l. and 2.

Seated within the recess l'l but spaced from the bottom thereof is a cup shaped stamping la having a dange fb seated on the dange lb of the body portion if.

The body if is deformed by means of a cap screw fi extending axially through the stamping it and threaded into a metal plate rlille member ff which is embedded in the body portion lli between the solid end of the same and the bottom of the recess. The head of the screws il, if desired, may be provided with a bail-like portion fi for turning the screw, which is swingable as shown in Fig. l into the cup of the stamping it.

after the closure is inserted in the container opening, the screw il is rotated to thread the same into the plate ff and this threading action obviously distorts the narrow walls lb of rubber, causing them to bulge circumferentially outwardly as shown in liig. if, by reason of the pressure tending to compress the closure. The compressive force also tends to expand the body of rubber between the outer walls of the cup lil and the wall of the container opening. This expansion of the rubber adjacent the wall of the container opening and the bulging of the same at the inner edge of the opening thus provides for a fluid tight lit of the closure within the container opening and also provides a means for very effectively preventing displacement of the closure from the opening. Such a closure is particularly adaptable for use in containers employed for transporting acids and the like since it may be formed oi' rubber.

The closure is simple in construction, economical to manufacture and can be easily inserted in and removed from the container opening.

Although a single embodiment of the invention l has been herein shown and described it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as denned in the following claims.

What I claim is:

l. in combination with a container having a wall provided with an opening, a closure plug for said opening, comprising a cylindrical body of resilient deformable material having a coaxial annular portion, said annular portion being disposable within said opening with said body disposed within said container, a rigid member engaging the end wall of said annular portion, a second member' connectively associated with said body, and means for moving said second member toward said rigid member whereby to longitudinally compress and bulge a portion of said annular portion outwardly into substantially overlapping relation with the inner edge of said opening.

-2. A closure plug for container openings, comprising a cylindrical body oi' resilient deformable material having a relatively thin walled annular portion, a rigid member engaging the end walls oi' said annular portion, an apertured plate embedded in said Vbody and. a screw member abutting the outer face oi said member at one end and threaded into said plate at its opposite end for drawing said member and body toward each other to circumferentiaily bulge said anV nular portion.

3. A cios-ure plug for container openings, com= prising a cylindrlcai bodr,f oi. rubber having an` apertured plate embedded therein and an arinular portion, a cup shaped stamping :dtting within said annular portion and spaced from said body', and a scrcviy extending through stamping and threaded into said apertured plate for drawing said stamping and body toward each.'

other to compress the annular portion lying therebetween and thereby expand said portion.

4. A closure plug for container openings, cornpriaing a body of rubber having an apertured plate embedded therein and having an annular portion, said annular portion having a radial container engaging flange, a rigid member extending acro said annular portion and engaging said ange, and a screw extending through said member and threaded into said apertured plate for moving said member and body toward each other to exert compressive pressure on said annular portion and circumi'erentially bulge the same radially outwardly.

5. A closure plug for container openings, comprising a'body of rubber having an apertured plate embedded therein and having an annular pol tion, said annular portion having a radial container engaging flange, a rigid member extending across said annular portion and engaging said ange, and a screw extending throughsaid member and threaded into said apertureci plate for moving said member and body toward each other HERMAN' T. KRAFT. 

